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From Martin Klepsch <>
Subject [pool] preparePool that only registers key, doesn't create new object
Date Fri, 20 Jan 2017 15:38:37 GMT

With a KeyedObjectPool I can use `setMinIdlePerKey` &  `preparePool` to
"bootstrap" an object pool. Now `preparePool` creates new objects
synchronously and the evictor thread doesn't seem to ensure min idle
objects if there are none yet (since it can't know the keys I guess).

Because of that I run into the situation that the evictor thread creates
objects for keys that are currently being created by `preparePool`. It's
not an absolute deal breaker but it would be nice to be able to register
keys without synchronously creating the minimum idle objects. Instead I'd
like to wait for the evictor thread to pick up newly registered keys and
create the required objects for it.

Unfortunately `register` is private and I don't see another way to trigger
key-registering. (Calling `preparePool` with `minIdlePerKey` set to 0 will
short circuit and not register the key).

Any suggestions welcome!

Cheers :)

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